Automatic riveting device

ABSTRACT

An upper pressure foot assembly is fixed to an upright column and mounts rams connected to a lower pressure foot assembly slidable on the column for clamping a workpiece therebetween. A ram operated support, mounted for swinging about the column axis, carries ram operated drilling and rivet holding means for perforating the workpieces and inserting and holding a rivet in the perforation. The lower pressure foot assembly has column gripping means and rivet squeezing means, ram operated in the order named. A system of switches, relays, solenoids and air valves provide interlocking controls for orderly sequential operation of the components of the device.

United States Patent 1 1 3 747 N3 Gregory July 24, 1973 [54] AUTOMATICRlVETlNG DEVICE 3,581,373 6/l97l Murdoch 29 24354 Inventor: G ne" w.Gregory, Chula vista 3,60l,880 8/1971 Brown 29/233 Calif.

Primary ExaminerCharlie T. Moon [73] Assignee: R0:l; Corporation, ChulaVista, An G or E P ar on Cai 22 Filed: June 9, 1970 57 ABSTRACT [21]Appl. No.: 45,171 An upper pressure foot assembly is fixed to an uprightcolumn and mounts rams connected to a lower pres- 52 vs. Cl 29/24353,29/522, 227/51, sure iq g 1 fogc'ampmg 227/152 a wor piece t ere etween.ram operate support, mounted for swinging about the column axis, carries[51] Int. Cl B23p 11/00 ram operated drilling and rivet holding meansfor per- [58] Field of Search 227/30, 51, 152, foratin the work iecesand .nsemn and holdn 29/522, 243.53, 243.54, 243.55, 233 g g g a rivet mthe perforation. The lower pressure foot assembly has column grippingmeans and rivet squeezing [56] References cued means, ram operated inthe order named. A system of UNITED STATES PATENTS switches, relays,solenoids and air valves provide interl,493,52l 5/1924 Corson 29/233locking controls for orderly sequential operation of the Stuart comonents of the device 2,405,779 8/1946 Davis 29/24353 p 3,156,087 11/1964Granberg 29/243.54 8 Claims, 8 Drawing Figures Pmimwwm 3.141. 193

SHEET E OF 5 IN VENTOR. GERRETT W.. GREGORY ATTORNEY Pmmwmz 314x193SHEEI 3 0f 5 l"- v l INVENTOR. GERRETT w. GREGORY FIG/3 BY i'pm ATTORNEYPATENTED JUL34'973 3.747. 193

SHEET w 0F 5 IW ENTOR. GERRETT W. GREGORY ATTORNEY AUTOMATIC RIVE'IINGDEVICE BACKGROUND OF THE INVENTION The present invention relates toriveting machines, and more particularly to a relatively compact benchtype riveting device which is readily portable and operatesautomatically to clamp a workpiece, drill a hole therein, insert andhold a rivet in the hole, and squeeze the rivet.

Conventional riveting machines usually include a C- frame for receivingand clamping the parts and supporting power operated equipment fordrilling and riveting. Of necessity, the C-frame is of relatively largerugged construction and the machines are usually so huge and heavy that,for all practical purposes, they are permanently fixed in place. Thisrequires that all work be brought to the machines. Additionally, suchmachines are complex and costly, and require a considerable amount ofspace. Since the machines are fixed in place, the use of such space isdenied for other purposes, whether or not the machine is beingprofitably employed.

Obviously a riveting device which is of relatively inexpensiveconstruction, compact and readily portable, yet is capable of performingrequired work on a competitive economical basis, would be welcome in thefabricating industry.

SUMMARY OF THE INVENTION The present invention contemplates and isconcerned with riveting devices and has as its primary purpose theprovision ofa device which consists essentially of a supporting columnor post on which are mounted workpiece clamping means, a drill and rivettransfer and holding means swingable together about the column axis, andrivet squeezing means. The clamping means include a pressure foot fixedto the column and a movable pressure foot mounted on the column fortravel along a path parallel to the column axis, the rivet squeezingmeans being associated with the movable pressure foot and movabletherewith. The drill and rivet transfer and holding means are supportedabaxially and are alternately alignable with the clamped workpiece fordrilling a hole therein and inserting a rivet in the hole, after whichthe rivet is squeezed to upset the same and form a headed enlargementthereon.

The present invention has the advantage being of compact ruggedconstruction for use on a bench with access to a source of pressurizedair, or on a vehicle which has a motor driven compressor. Being airoperated, the components are resiliently urged into operation, therebyminimizing the danger of straining. Also, by mounting the drill andrivet holding means for swinging in an arcuate path, the arc of swingingcan be time shared and additional mechanisms can be provided forperforming additional operations or duplicating operations on theopposite side of the column.

BRIEF DESCRIPTION OF DRAWINGS FIG. I is a highly schematic perspectiveview of a riveting device embodying the principles of the presentinvention.

FIG. 2 is a front elevational view of the riveting device.

FIG. 3 is a side elevational view of the device.

FIGS. 4 7 are horizontal sectional views generally along lines 4-4, 5-5,6-6 and 7-7, respectively, of FIG. 3, with parts omitted or broken awayfor clarity of illustration.

FIG. 8 is a bus bar diagram schematically illustrating the action of theinterlocking controls of the device and indicating various operationalevents.

DESCRIPTION OF EMBODIMENT Referring to the drawings, there is shown inFIG. 1 a highly schematic perspective view of a riveting device 10embodying the principles of the present invention which includes anupright column or post 12, an upper pressure foot assembly 14 fixed tothe post, and a lower pressure foot assembly 16 mounted for sliding onthe post along a path parallel to the column axis A in alignment withthe upper pressure foot assembly and adapted to clamp workpiece Wtherebetween. Also mounted on the column, for swinging about the axis Athereof, is a support member 18 which carries a rotary drill 20 andrivet transfer fingers 22 spaced from the axis so as to be alignablewith the pressure feet. The fingers are spring loaded for resilientlyholding a rivet R and has associated therewith a vertically movablelocking anvil 24 which is adapted to force the rivet from the fingers.As hereinafter described in greater detail, the device is powered withpressurized air and has interlocking electrical and pneumatic controlswhich operate automatically, after closing an initiating switch, tocause the lower pressure foot assembly 16 to ascend and clamp theworkpiece against the upper pressure foot assembly 14, and be locked tothe post 12. The drill 20 then starts rotating and descends to drill arivet hole in the workpiece after which it ascends and stops. Thistriggers swinging movement of the support member 18 to move the drillaway and replace it with the rivet transfer fingers 22 which thendescend to insert a rivet in the hole, the anvil 24 being locked againstthe rivet head. Following this, a rivet squeezing anvil 26 carried bythe lower pressure foot assembly rises and forms the free end of therivet into a headed enlargement, and then descends. When the initiatingswitch is opened, the device returns to starting condition ready foranother riveting operation.

As later made clear, the several components are conditioned or triggeredby the action of limit switches LS1 through L810 and associatedmulti-contact, circuitrelays CR1 through CR7, which are operativelyrelated to solenoids SOLl through SOL8 for actuating valves forcontrolling the flow of pressurized air to the components. Othercontrols include push button switches PBI and P82, and foot switches F81and F82. The push button and foot switches, relays, solenoids and valvesare not shown but can be conveniently mounted on a board or'boardslocated out of the way but connected electrically an pneumatically tothe device, as necessary. The interrelation of the several controls willbe made more clear when the operation of the device is hereinafterdescribed.

Inviting attention to FIGS. 2 and 3, the column or post 12 is mounted ona base or pedestal 28 and extends upwardly therefrom. The upper pressurefoot assembly 14 includes a cantilever support arm 30 having a splitportion 32 and adapted to be fixedly clamped to the column 12 by a bolt34, as shown in FIG. 4. Mounted below the arm 30 is a pressure foot 36,both of which are suitably apertured to receive the drill 2t).

Additionally, a slot 38 is formed in the arm to accommodate swinging ofthe drill.

The support arm 30 also serves as a mounting base for a pair of clampingrams 40, each having a movable rod 42 adjustably connected to the lowerpressure foot assembly 16 by means of coupling sleeves 44, threadedlinks 46, lock nuts 48 and knurled nuts 50. The rams are powered bypressurized air delivered through lines and solenoid-operated valves,not shown.

The lower pressure foot assembly 16 includes a horizontally disposedsupport member 52 suitably perforated to receive the links 46 andadjustably secured thereto by the knurled nuts 50. The member 52 issecured to the upper edge of a collar 54 close-fitted to the post 12 forsliding thereon. As best seen in FIGS; 3 and 5, extending substantiallyhalf-way around the collar is an arcuate slot 56 from the midportion ofwhich a vertical slot 58 extends downwardly. This provides the collarwith a split portion to which are fixed substantially rigid arms 60,slightly spaced apart and interconnected by a bolt 62 passingtherethrough.

Threadedly connected to one of the arms 60 is a headed screw bolt 64which passes loosely through the other arm and pivotally mounts a pairof arms 66 and 68 having cam surfaces 70 and 72 respectively. Pivotallymounted on the arm 66, by means ofa pivot pin 74, is an angle bracket76. The bracket carries a locking ram 78 having a movable rod 80pivotally connected the free end of the arm 68 by a pivot bolt 82.

The ram 78 is powered by pressurized air delivered thereto through linesand solenoid operated valve, not shown, and is operative to retract itsrod 80 for moving the cam surfaces 70, 72 relative to each other to drawthe arms 60 toward each other and cause the split portion of the collar54 to grip the column 12 and lock the lower pressure foot assembly 16thereto. During operation of the ram 78 to lock the assembly and columntogether, the ram swings about the axis of the pin 74 and closes anormally open limit switch LS1, the switch being suitably supported onthe arm 66.

Adjustably mounted above the support member 52, by means of threadedrods 84 and knurled nuts 86, is a support plate 88 which mounts a lowerpressure foot attachment 90. The attachment is hollow and receives thelower anvil 26.

The plate 88 is secured to the lower edge of an upstanding collar 92slidably fitted to the column 12. Mounted on the collar is a doublecontact limit switch LS8 normally engaged with one contact in the downposition of the lower pressure foot assembly 16 and actuated toengagement with the other contact by a bolt 94 adjustably mounted on theunderside of support member 30. The bolt is adjusted so that actuationof the switch occurs when workpieces are clamped between the pressurefeet 36 and 90. For maintaining the pressure feet vertically aligned,the collar 54 is formed with a vertical guide slot 96 in which isslidably received a guide pin 98 secured to the column 12, best seen inFIG. 2.

The lower anvil 26 and pressure foot 90 are parts of a rivet squeezingmechanism 100 of suitable type secured to the support member 52 by bolts102. Typical of such mechanisms is that designated Lower Anvil andPressure Foot Assembly, TS422OS, manufactured by Rohr Corporation, ChulaVista, Calif. Such mechanism is powered by pressurized air deliveredthrough a conduit 104 fragmentarily shown and controlled by asolenoid-operated valve, not shown. The pressurized air operates a ram,now shown, which actuates a rod 106 having an adapter 108 securedthereto for driving the anvil 26. The member 52 has a suitable bore 110for passage of the rod, as shown in FIG. 5, and mounts a limit switchLS9. The switch has two contacts and is actuated by operation of themechanism 100.

Considerable forces are involved in the squeezing of the rivet.Accordingly, the mechanism 100 has bolted thereto a force-transmittingbracket 112 having an arcuate guide surface, not shown, slidablyengaging the column 12. This arrangement provides a movable brace forthe lower pressure foot assembly 16 and transmits the reaction forces tothe column.

Referring also to FIG. 7, the support member 18 includes a sector plate114 and a rib 116, both secured to ajoumal collar 118 fitted to thecolumn 12 for rotation about the axis A thereof and held thereon on aretaining ring 120 fixed to the column above the collar. Fixed to thecolumn, below the sector plate, is an attaching collar 122 to which issecured a laterally extending arm 124. An angle bracket 126 is pivotedto the arm 124 by means of a pivot pin 128 and mounts a positioning ram130 operated by pressurized air delivered through lines, not shown. Theram has a movable rod 132 pivotally connected to the sector plate 114 bya pivot pin 134 for swinging the sector plate. Adjustably secured to theattaching collar 122 are spaced slotted stops 136 adapted to engage withan abutment member 138 disposed therebetween and dependingly fixed tothe underside of the sector plate. Thus, the stops define the limits ofswinging of the sector plate and the positioning ram holds the sectorplate resiliently in its limit positions.

The drill 20 can be of any suitable type; for example, the Air FeedDrill, 92-D2-45, manufactured by Gardner-Denver Company, Quincy, III.This drill is air operated and, once energized, automatically rotates,descends and drills a hole, ascends to its normal up position and stops.The drill is secured in place by a drill mounting plate 140 bolted tothe sector plate 114.

The rivet transfer fingers 22 and upper anvil 24 are parts of amechanism 142 suitable for transfering a rivet and holding it forsqueezing, and can be the air operated mechanism designated RivetFingers and Transfer Assembly TS 17-775-700, manufactured by RohrCorporation, Chula Vista, Calif. Such mechanism is mounted on the sectorplate 114 by a member 144 and also includes a vertically movable plunger146 operable to move the spring loaded fingers 22 and anvil 24vertically. Rivets can be fed to the fingers manually or automaticallyby rivet feed means, not shown.

Associated with the drill 20 and controlled by the upand-down movementthereof are limit switches LS2 and LS3 adjustably secured to anupstanding support 148 stationarily mounted with respect to the sectorplate 114, best seen in FIG. 2. Switch LS2 has two contacts, one ofwhich is normally engaged when the drill is in its up or startingposition, the other contact being engaged when the drill is down,actuation of the switch being accomplished by an actuating finger 150adjustably supported on a threaded rod 152 which is vertically movablewith the drill. Switch LS3 is normally open and is actuated to closedposition by the finger 150 when the drill is in its up position.

Returning to FIG. 7, mounted on the sector plate 114 and movabletherewith are limit switches LS4 and L810, both of the normally opentype. Switch L810 is actuated to closed position by an actuating button154 on the retaining ring 120, the button being located to actuate theswitch when the drill 20 is properly positioned for alignment with thepressure feet 36 and 90.

Proper positioning of the drill is obtained by suitable adjustment ofthe appropriate limit stop 136. Limit switch LS4 is actuated to closedposition by a button 156 which is appropriately located for actuation ofthe switch when the mechanism 142 is properly aligned with the pressurefeet, the other limit stop 136 being suitably adjusted for the purpose.Thus, when the drill is properly positioned for drilling a hole in theworkpieces, switch LS is closed and switch LS4 is open, the situationbeing reversed when the drill has been replaced with the mechanism 142.

Associated with the mechanism 142 are limit switches LS5, LS6 and LS7,all of the normally open type. Switch LS5 is suitably supported on ablock 158 surrounding the lower end of the plunger 146 and is actuatedto closed position when the plunger moves the fingers 22 and upper anvil24 downwardly. The block 158 is adjustably mounted on the sector plate114 by threaded rods 160. Switch LS7 is supported on the upper side ofthe sector plate, as shown in FIG. 7, and is actuated to closed positionby the plunger when the plunger, fingers and upper anvil are up.

Switch LS6 is supported on the block 158, which also supports an airoperated ram 162. The ram is operative to move a blocking bar or bolt,not shown, to lock the upper anvil 24 against the head of the insertedrivet after the anvil has forced the rivet from the spring loadedfingers 22. Simultaneously, the limit switch LS6 is actuated to closedposition by operation of the ram.

OPERATION The operation of the riveting device 10 of the presentinvention is believed to be clearly apparent and is summarized at thispoint. Referring to FIG. 8, and with the device connected to electricpower and a source of pressurized air, when connection is made toelectrical power, a circuit is completed through normally closed OFFpush button switch PBl, normally closed contacts CR1B of circuit relayCR1 and red warning light LTl comes on. When normally open ON pushbutton switch PR2 is closed, circuit relay CR1 is energized and thecontacts thereof change state, that is, contacts CRlB open and normallyopen contactsCR1A, CR1C and CRlD close, the red light goes out and bluelight LT2 comes on. When contacts CR1A close, a bypass is providedaround the switch P132 to maintain circuit relay CR1 and the blue lightenergized. When contact CRlD close, a circuit is completed whichenergizes solenoid SOLS and actuates its associated air valve, admittingpressurized air to the device. RESET foot switch FS2 is pushed to insurethat all parts are in starting position.

The workpieces to be drilled and riveted together are placed against theunderside of the upper pressure foot 36 and the foot switch FSl isoperated to closed position. Electric current then flows through closedcontacts CR1C, normally closed contacts CR4C of circuit relay CR4, limitswitch LS8 and the closed foot switch PS1, to the circuit relay CR2 toenergize the same and cause its contacts CRZA and CR2B to change fromnormally open to closed. As the same time, current flows throughnormally closed contacts CR4A of circuit relay CR4 to energize solenoidSOL] and actuate its air valve to cause pressurized air to be deliveredto the clamping rams 40 to cause upward movement of the lower pressurefoot assembly 16 for clamping the workpieces between the pressure feet36 and 90.

Upward movement of the lower pressure foot assembly 16 actuates thelimit switch LS8 to its other contact and current flows through closedcontact CR1C and CR4C, limit switch LS8, and normally closed contactsCR7A of circuit relay CR7, to energize solenoid SOL2 and actuate its airvalve to cause the post locking ram 76 to retract and cause the splitcollar 54 to grip the post 12. This causes the ram 78 to pivot andactuate normally open limit switch LS1 to closed position.

Closure of switch LS1 completes a circuit through closed contacts CRlCand CR4C, limit switches LS8, LS1, LS2 (through normally engagedcontact) and L810, and normally closed contacts CR3A of circuit relayCR3, to energize solenoid SOL3 and its associated air valve. This causesthe drill 20 to start rotating and descend to drill a hole in theworkpieces.

At the end of drill descent, limit switch LS3 is open and limit switchLS2 has moved into engagement with its other contact. This energizescircuit relay CR3, causing its contacts CR3A to open and normally opencontacts CR3B and CR3C to close, thereby providing a path for power tothe circuit relay CR3 through the normally closed RESET foot switch PS2and closed contacts CR2B. Also, solenoid SOL3 is deenergized and thedrill returns to its up position, which closes limit switch LS3 andenergizes circuit relay CR5 and solenoid SOL4.'With energization ofcircuit relay CR5, its normally open contacts CRSA are closed and amaintaining circuit is provided which shunts limit switch LS3.

Energization of solenoid SOL4 causes the positioning ram 130 to retractand swing the drill 2t] and rivet transfer mechanism 142 so that thefingers 22 are aligned with the drilled hole in the workpieces. Thisopens limit switch L810 and closes limit switch LS4.

Closure of switch LS4 provides power to solenoid SOL5 through limitswitches LS8 and LS4 and closed contacts CRSB of circuit relay CR5 andCR7B of circuit relay CR7. This energizes the solenoid which causesdownward movement of the plunger 146 and the rivet holding fingers 22for insertion of a rivet into the drilled hole. The upper anvil 24engages against the rivet head and forces the rivet from the fingers.

Downward movement of the plunger 146 opens limit switch LS7 and closeslimit switch LS5, thereby completing a circuit to energize solenoidSOL6. The bolt lock ram 162 then extends and locks the upper anvil 24and the rivet against upward movement.

Movement of the bolt lock to locking position results in closure oflimit switch LS6 and solenoid SOL7 is energized through normally closedcontacts CR6A of circuit relay CR6. This causes the rivet squeezemechanism 1110 to operate and drive the lower anvil 26 against the rivetend to squeeze the same. It also causes limit switch LS9 to changecontacts and circuit relay CR6 is energized.

Energization of circuit relay CR6 causes contacts CR6A to open andnormally open contacts CR6B and CR6C to close. Closure of contacts CR6Bprovides a circuit around limit switch LS9 for maintaining circuit relayCR6 energized. Opening of contacts CR6A deenergizes solenoid SOL7 andthe rivet squeeze mechanism gravitates to its normal down position,limit switch LS9 changing contacts in the process to cause energizationof circuit relay CR7 through closed contacts CR6C.

Energization of circuit relay CR7 causes its normally open contacts CR7Cto close and provide an energization maintaining by-pass around limitswitch LS9. It also causes normally closed contacts CR7A and CR7Bthereof to open and interrupt energization of solenoids SOL7, SOL6, SOLSand SOLZ, so that the bolt lock ram 162 unlocks the anvil 24, thefingers 22 ascend, and the lower pressure foot assembly 16 is unlockedfrom the column or post 12.

With the fingers 22 up, limit switch LS7 is closed and circuit relay CR4is energized and normally open contacts CR4B thereof are closed formaintaining energization of the relay. Normally closed contacts CR4A andCR4C of the relay become open with the result that solenoid SOLl isdeenergizcd and power is cut off to the limit swijch LS8 and RESET footswitch FS2, resulting in the deenergization of solenoid SOL4 and circuitrelays CR3 and CR5. Deenergization of solenoid SOL4 causes positioningram 130 to extend and swing the drill and mechanism 142 back to startingposition, limit switch LS4 opening and limit switch LS10 closing in theprocess. With solenoid SOLl deenergized, pressurized air is removed fromthe clamping rams 40 and the lower pressure foot assembly 16 gravitatesto its normal starting position, limit switch LS8 changing to its normalstarting contact.

When foot switch PS1 is released to open position, circuit relay CR2 isdeenergizcd, resulting in opening of its contacts CRZA and consequentdeenergization of circuit relays CR4, CR6 and CR7, the contacts thereofreturning to their normal conditions. The device is now ready foranother drilling and riveting operation. To insure that all parts are instarting position, RESET foot switch FS2 is momentarily opened and thenallowed to return to normally closed position.

Shutdown of the device is accomplished by pushing the OFF push buttonswitch PBl open to deenergize circuit relay CR1 and allow its contactsto return to normal conditions. This extinguishes blue light LT2, anddeenergizes solenoid SOL8, cutting off pressurized air to the device.When the OFF switch is released, red light LT] comes on. Disconnectionof the device from electrical power extinguishes the red light LTl.

Stated more simply, the steps of operation are:

1. Foot switch is depressed. (FSl) a. Workpieces are clamped and lockedto column. b. Drill turns on, descends, drills hole, ascends,

stops turning. c. Fingers swing over, descend and insert rivet. d. Upperanvil forces rivet from fingers. e. Upper anvil is locked against upwardmovement. f. Rivet squeeze operates, lower anvil ascends and descends.i. Upper anvil is unlocked. ii. Column is unlocked. iii. Fingers ascendand swing over.

2. Foot switch is released. (FSl) There has thus been provided ariveting device in accordance with the present invention which is ofeconomical construction, rugged and compact, for operation on a bench orportable vehicle, and operates automatically in a safe and reliablemanner at a relatively rapid rate.

Although the present invention has been herein shown and described inconsiderable detail in what is believed to be the most practical andpreferred embodiment thereof, it is to be understood that manyvariations thereof are possible and that the present invention is not tobe limited to such details but is to be considered in its broadestaspects and accorded the full scope of the appended claims.

Having thus described the invention, what is claimed as new and desiredto be protected by U. S. Letters Patent is:

l. A device for riveting workpieces together comprising:

an elongated support structure having a longitudinal axis;

clamping means including a first member fixedly mounted on saidelongated support structure and a second member movable with respect tosaid first member along a path parallel to the axis of said elongatedsupport structure adapted to clamp workpieces together for riveting;

swingtable support structure for supporting a drill and rivet holdingand inserting means mounted abaxially on said elongated supportstructure for arcuate movement about said axis thereof to a first drillposition wherein said drill is aligned with the path of said secondmovable member and operable to drill a hole in said workpieces and asecond rivet inserting position wherein said drill is swung out ofalignment with said path of said second movable member and said rivetholding and inserting means is aligned therewith for inserting a rivetin said hole of the workpieces and means carried by said second memberand operable for squeezing said rivet and forming a head enlargementthereon.

2. The device of claim 1 in which said movable means also includesstructure gripping means actuatable to gripping position prior tosqueezing of the rivet for locking the movable means to the structure.

3. The device of claim 1 in which said movable means includes a supporton which said squeezing means is mounted, said support slidingly engagedthe structure and serving to transmit thereto reaction forces imposed onthe movable means during squeezing of the rivet.

4. The device of claim 1 in which said structure is an upright post, alaterally extending support plate mounted on the upper end of the postfor swinging movement about the axis thereof, said drill and rivetholding means mounted on the support in angularly spaced relation andfor movement relative to the post, pressure applying means on saidmovable means movable therewith along the path of travel thereof,pressure receiving means fixedly mounted on the post below the drill inalignment with the pressure applying means, said workpieces to beriveted being receivable between said pressure means for clampingtherebetween, control means responsive to upward movement of thepressure applying means to clamping position for causing the drill torotate and descend to form a hole in the clamped parts and then ascendand stop, control means responsive to ascension of the drill for causingpivotal movement of the plate to align the rivet holding means with theformed hole, and means responsive to said pivotal movement of the platefor causing the rivet holding means to descend and insert the rivet inthe hole.

5. The device of claim 4 in which said movable means includes postgripping means actuable to a position locking the movable means to thepost, and control means responsive to movement of the movable means toclamping position for actuating the post gripping means to lockingposition.

6. The device of claim 4 in which the rivet holding means includes amovable anvil, control means responsive to descent of the rivet holdingmeans for pressing the anvil against the rivet and locking it in placethereagainst, and rivet squeezing means on the movable means forupsetting the rivet.

7. The device of claim 6 in which the movable means includes a platehaving a laterally extending arm, a support below said arm fixedlyconnected thereto, said support slidingly engaging the post andtransmitting thereto reaction forces imposed on the movable means as aresult of the upsetting of the rivet by the rivet squeezing means.

8. The device of claim 1 in which the structure is a cylindrical column;a sector plate journaled on the column for swinging movement about theaxis thereof; drill and rivet holding means on said sector plate havingangularly spaced axes of operation parallel to the column axis and atthe same radial distance therefrom;

ram means interconnecting the sector plate and the column for pivotingthe drill and rivet holding means; workpiece clamping means including apair of pressure foot means, one fixed to the column and the othermovably mounted thereon; ram means associated with the fixed pressurefoot means operative to move the movable pressure foot means toward thefixed pressure foot means to a position clamping the workpiece at a workstation, ram-operated column gripping means associated with the movablepressure foot means and responsive to movement thereof to workpiececlamping position for locking the same to the column; means responsiveto operation of the column gripping means operative to cause the drillto descend, drill a hold in the clamped parts and ascend, meansresponsive to ascension of the drill operative to cause the first-namedram means to operate and swing the drill and rivet holding means toalign the latter with the drilled hole; means responsive to suchalignment operative to cause the rivet holding means to insert a rivetin the hole and hold it therein; and rivet squeezing means associatedwith the movable pressure foot means and operative to upset the free endof the rivet and form a headed enlargement thereon.

1. A device for riveting workpieces together comprising: an elongatedsupport structure having a longitudinal axis; clamping means including afirst member fixedly mounted on said elongated support structure and asecond member movable with respect to said first member along a pathparallel to the axis of said elongated support structure adapted toclamp workpieces together for riveting; swingtable support structure forsupporting a drill and rivet holding and inserting means mountedabaxially on said elongated support structure for arcuate movement aboutsaid axis thereof to a first drill position wherein said drill isaligned with the path of said second movable member and operable todrill a hole in said workpieces and a second rivet inserting positionwherein said drill is swung out of alignment with said path of saidsecond movable member and said rivet holding and inserting means isaligned therewith for inserting a rivet in said hole of the workpiecesand means carried by said second member and operable for squeezing saidrivet and forming a head enlargement thereon.
 2. The device of claim 1in which said movable means also includes structure gripping meansactuatable to gripping position prior to squeezing of the rivet forlocking the movable means to the structure.
 3. The device of claim 1 inwhich said movable means includes a support on which said squeezingmeans is mounted, said support slidingly engaged the structure andserving to transmit thereto reaction forces imposed on the movable meansduring squeezing of the rivet.
 4. The device of claim 1 in which saidstructure is an upright post, a laterally extending support platemounted on the upper end of the post for swinging movement about theaxis thereof, said drill and rivet holding means mounted on the supportin angularly spaced relation and for movement relative to the post,pressure applying means on said movable means movable therewith alongthe path of travel thereof, pressure receiving means fixedly mounted onthe post below the drill in alignment with the pressure applying means,said workpieces to be riveted being receivable between said pressuremeans for clamping therebetween, control means responsive to upWardmovement of the pressure applying means to clamping position for causingthe drill to rotate and descend to form a hole in the clamped parts andthen ascend and stop, control means responsive to ascension of the drillfor causing pivotal movement of the plate to align the rivet holdingmeans with the formed hole, and means responsive to said pivotalmovement of the plate for causing the rivet holding means to descend andinsert the rivet in the hole.
 5. The device of claim 4 in which saidmovable means includes post gripping means actuable to a positionlocking the movable means to the post, and control means responsive tomovement of the movable means to clamping position for actuating thepost gripping means to locking position.
 6. The device of claim 4 inwhich the rivet holding means includes a movable anvil, control meansresponsive to descent of the rivet holding means for pressing the anvilagainst the rivet and locking it in place thereagainst, and rivetsqueezing means on the movable means for upsetting the rivet.
 7. Thedevice of claim 6 in which the movable means includes a plate having alaterally extending arm, a support below said arm fixedly connectedthereto, said support slidingly engaging the post and transmittingthereto reaction forces imposed on the movable means as a result of theupsetting of the rivet by the rivet squeezing means.
 8. The device ofclaim 1 in which the structure is a cylindrical column; a sector platejournaled on the column for swinging movement about the axis thereof;drill and rivet holding means on said sector plate having angularlyspaced axes of operation parallel to the column axis and at the sameradial distance therefrom; ram means interconnecting the sector plateand the column for pivoting the drill and rivet holding means; workpiececlamping means including a pair of pressure foot means, one fixed to thecolumn and the other movably mounted thereon; ram means associated withthe fixed pressure foot means operative to move the movable pressurefoot means toward the fixed pressure foot means to a position clampingthe workpiece at a work station, ram-operated column gripping meansassociated with the movable pressure foot means and responsive tomovement thereof to workpiece clamping position for locking the same tothe column; means responsive to operation of the column gripping meansoperative to cause the drill to descend, drill a hold in the clampedparts and ascend, means responsive to ascension of the drill operativeto cause the first-named ram means to operate and swing the drill andrivet holding means to align the latter with the drilled hole; meansresponsive to such alignment operative to cause the rivet holding meansto insert a rivet in the hole and hold it therein; and rivet squeezingmeans associated with the movable pressure foot means and operative toupset the free end of the rivet and form a headed enlargement thereon.